The symptoms of ADHD, if not adequately managed, will have many life long effects on the patients, families, friends, peers, teachers and colleagues. For the patients, the disorder will impact on patient's academic, social and emotional performance, and behavioural development, leading to poor academic achievement, low occupational status, increased risk of substance abuse and delinquency. More than 30% of children with ADHD repeat a year in school and up to 56% require remedial tutoring.